Porsche has revealed the 911 Turbo Cabriolet and 911 Turbo S Cabriolet ahead of a debut at the Los Angeles Motor Show in November.

The 2014 Porsche 911 Turbo Cabriolet and Turbo S Cabriolet have been revealed

Update:We published this article before Porsche revealed UK prices for the Turbo and Turbo S Cabriolet. But now we have them.

The Porsche 911 Turbo cabriolet will cost £126,766 and the Turbo S Cabriolet £149,511, with both going on sale December 2013.

We’ve also added video of the Turbo and Turbo S Cabriolet.

We only had the reveal of the new Porsche 911 Turbo and Turbo S in May – and a public debut at the Frankfurt Motor Show last week – but Porsche are now rolling out the cabriolet versions of their most powerful 911.

The Porsche 911 Turbo and Turbo S have been revealed this morning ahead of their public debut at the Los Angeles Auto Show in November, and bring open-top motoring to the most powerful cars in the 911 range.

Sporting the same new 3.8 litre flat six as the coupe Turbos, the Turbo Cabriolet comes with 513bhp of grunt and the Turbo S Cab with 552bhp.

That’s enough to get the Turbo to 62mph in 3.5 seconds and the Turbo S to 62mph in 3.2 seconds, figures that shame all but the most extreme supercars you can buy. Despite the extreme performance, Porsche make official economy claims of a frankly unattainable (in the real world) 28.5mpg.

The two Turbo cabriolets get the same wider body as the coupe (28mm wider than the 4), the same PDK ‘box, the same PTM all-wheel drive and the same rear axle steering.

But where the cabriolet differs is in the panel bow top with iuts lightweight magnesium frame, a design that allows the cabriolet to keep the coupe’s arch roof profile when the roof is up, aids aerodynamics and can open or close in just 13 seconds.

It all makes the 911 Turbo and Turbo S Cabriolets perhaps the most usable and practical of the supercar convertibles, as well as probably the quickest in any real world situation.

The new Porsche Turbo and Turbo S Cabriolets go on sale in Germany in December. We don’t have UK prices yet, but the Turbo costs €174,431 and the Turbo S €207,989 in Germany.